检索结果-南通市图书馆

Multiple-dimensioned defect engineering for graphite felt electrode of vanadium redox flow battery

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Carbon Energy 2024年第2期6卷 143-153页

作者： Yingqiao Jiang yinhui Wang Gang Cheng Yuehua Li Lei Dai Jing Zhu Wei Meng Jingyu Xi Ling Wang Zhangxing he School of Chemical Engineering North China University of Science and TechnologyTangshanChina Tsinghua Shenzhen International Graduate School Institute of Materials ResearchTsinghua UniversityShenzhenChina

The scarcity of wettability,insufficient active sites,and low surface area of graphite felt(GF)have long been suppressing the performance of vanadium redox flow batteries(VRFBs).herein,an ultra-homogeneous multipledimensioned defect,including nano-scale etching and atomic-scale N,O codoping,was used to modify GF by the molten salt ***_(4)Cl and KClO_(3) were added simultaneously to the system to obtain porous N/O co-doped electrode(GF/ON),where KClO_(3) was used to ultra-homogeneously etch,and O-functionalize electrode,and NH4Cl was used as N dopant,***/ON presents better electrochemical catalysis for VO_(2)+/VO_(2)+ and V3+/V2+ reactions than only O-functionalized electrodes(GF/O)and *** enhanced electrochemical properties are attributed to an increase in active sites,surface area,and wettability,as well as the synergistic effect of N and O,which is also supported by the density functional theory ***,the cell using GF/ON shows higher discharge capacity,energy efficiency,and stability for cycling performance than the pristine cell at 140 mA cm^(−2) for 200 ***,the energy efficiency of the modified cell is increased by 9.7% from 55.2% for the pristine cell at 260 mA cm^(−2).Such an ultra-homogeneous etching with N and O co-doping through“boiling”molten salt medium provides an effective and practical application potential way to prepare superior electrodes for VRFB.

关键词： graphite felt molten salt N O co-doping ultra-homogeneous etching vanadium redox flow battery

Research on Anti-Fluctuation Control of Winding Tension System Based on Feedforward Compensation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第5期139卷 1239-1261页

作者： Yujie Duan Jianguo Liang Jianglin Liu Haifeng Gao yinhui Li Jinzhu Zhang Xinyu Wen College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan030024China College of Electronic Information and Optical Engineering Taiyuan University of TechnologyTaiyuan030024China School of Electronic Information Engineering Taiyuan University of Science and TechnologyTaiyuan030000China

In the fiber winding process,strong disturbance,uncertainty,strong coupling,and fiber friction complicate the winding constant tension *** order to effectively reduce the influence of these problems on the tension output,this paper proposed a tension fluctuation rejection strategy based on feedforward *** addition to the bias harmonic curve of the unknown state,the tension fluctuation also contains the influence of bounded noise.A tension fluctuation observer(TFO)is designed to cancel the uncertain periodic signal,in which the frequency generator is used to estimate the critical parameter ***,the fluctuation signal is reconstructed by a third-order auxiliary *** estimated signal feedforward compensates for the actual tension ***,a time-varying parameters fractional-order PID controller(TPFOPID)is realized to attenuate the bounded noise in the ***,TPFOPID is enhanced by TFO and applied to control a tension control system considering multi-source *** stability of the method is analyzed by using the Lyapunov ***,numerical simulations verify that the proposed scheme improves the tracking ability and robustness of the system in response to tension fluctuations.

关键词： Constant tension control anti-fluctuation strategy tension fluctuation observer time-varying parameters fractional-order PID controller feedforward compensate

Crystallization management of CsPbI2Br perovskites by PbAc2-incorporated twice spin-coating process for efficient and stable CsPbI2Br perovskite solar cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第10期97卷 419-428页

作者： Yu Liu Kun Lang Huifang Han Huijing Liu Yao Fu Pengchen Zou yinhui Lyu Jia Xu Jianxi Yao State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing Key Laboratory of Energy Safety and Clean Utilization North China Electric Power University

CsPbI2Br perovskite solar cell has been extensively studied due to its exceptional thermal stability and relatively stable perovskite phase ***,the presence of bromine leads to a rapid crystallization rate of CsPbI2Br films,resulting in small grain size and high defect ***,CsPbI2Br demonstrates poor light absorption due to its wide ***,it is crucial to control the crystallization rate and increase the film thickness to reduce defect density,enhance light absorption,and improve photovoltaic *** this study,we utilized a PbAc2-incorporated twice spincoating（PTS） process to address these ***,PbAc2was added to the CsPbI2Br precursor solution to form a CsPbI2Br film,which was then coated with the CsPbI2Br precursor solution to produce the PTS film,Ac-can delay the perovskite crystallization,leading to the formation of thicker and denser CsPbI2Br ***,lone-pair electrons of the oxygen atom provided by Ac-formed coordination bonds with under-coordinated Pb2+ions to fill halogen ion vacancies,thereby reducing the defect ***,the PTS CsPbI2Br device achieved a peak power conversion efficiency（PCE） of 16.19% and maintained 96.7% of its initial PCE over 1500 h at room temperature under 25% relative humidity without any encapsulation.

关键词： Crystallization management CsPbI2Br PbAc2 Perovskite solar cells Twice spin-coating process

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

融合结构重参数化变换的气体泄漏红外检测

光子学报 2024年第1期53卷 187-201页

作者：庄宏张印辉何自芬曹辉柱昆明理工大学机电工程学院昆明650500

针对常规工业气体泄漏检测装置需泄漏扩散到一定范围并与传感器接触时才能响应的不足,提出一种融合结构重参数化变换的红外非接触式检测网络模型GRNet。GRNet模型采用Mosaic-Gamma变换的预处理方法增加泄漏样本数量并提高图像对比度以... 详细信息

针对常规工业气体泄漏检测装置需泄漏扩散到一定范围并与传感器接触时才能响应的不足,提出一种融合结构重参数化变换的红外非接触式检测网络模型GRNet。GRNet模型采用Mosaic-Gamma变换的预处理方法增加泄漏样本数量并提高图像对比度以增强模型的鲁棒性;通过K-means聚类分析出适用于气体泄漏红外检测的候选框以预置模型参数;优化定位损失函数以提高模型对泄漏区域的定位准确性;采用改进后的轻量化网络RepVGG模块重构特征提取网络增强模型的特征提取能力,以实现轻量化并提高检测精度。实验结果表明,GRNet模型对氨气泄漏的平均检测精度达到94.90%,单张图像平均检测时间达到3.40 ms。采用伪色彩映射实现泄漏浓度的视觉感知效果,采用PyQt5将GRNet模型进行封装实现气体泄漏红外检测系统界面的可视化并在Jetson Nano B01嵌入式实验平台部署该模型,验证了实际工程应用的可行性和有效性,为开发气体泄漏非接触探测装置以保障涉气企业的安全生产和稳定运行提供一种有效的检测算法。

关键词：目标检测气体泄漏检测定位损失函数图像预处理聚类分析结构重参数化

维普期刊数据库

The Protective Effects of Flavonoids from Scutellaria Baicalensis Georgi Stems and Leaves on Oligodendrocyte Damage Induced by Aβ_1-42

在线全文

学校读者我要写书评

暂无评论

Pharmacology & Pharmacy 2024年第1期15卷 1-13页

作者： Tangtang Song yinhui Yao Yazhen Shang Institute of Traditional Chinese Medicine Chengde Medical College Chengde China hebei Province Key Research Office of Traditional Chinese Medicine against Dementia Hebei Province Key Laboratory of Traditional Chinese Medicine Research and Development Hebei Key Laboratory of Nerve Injury and Repair Chengde China

Aim: This study aimed to investigate the protective effects of flavonoids from the stem and leaves of Scutellaria baicalensis Georgi (SSFs) against Aβ1-42-induced oligodendrocytes (OL) damage. Methods: Immunofluorescence was used for the detection of myelin-associated glycoprotein (MAG), a characteristic protein of rat oligodendrocytes (OLN-93 cells). To evaluate the potential protective effects of SSFs on OLN-93 cells injured by Aβ1-42, an injury model was established by subjecting OLN-93 cells to Aβ1-42 exposed. Cell morphology was examined using an inverted microscope, while cell viability was assessed using the colorimetric method of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT). Additionally, lactate dehydrogenase (LDH) was measured using the pyruvic acid reduction assay. The Ginkgo biloba leaf extract (GBE) injection was used as a positive control. Results: A total of >95% of the MAG immunofluorescence-positive cells were identified as oligodendrocytes. Gradually increasing concentrations of SSFs impaired the cells, and the maximum nondetrimental dose for OLN-93 cells was 75 mg/L. This study assessed the effects of SSFs on OLN-93 cells damaged by Aβ1-42. The results indicated that SSFs significantly improved OLN-93 cell morphological abnormal changes, increased the OLN-93 cell survival rate, and reduced LDH release. Conclusion: SSFs can alleviate Aβ1-42-induced damage of OL.

关键词： Flavonoids form the Stem and Leaves of Scutellaria baicalensis Georgi Aβ1-42 Oligodendrocytes Damage

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

注意力引导的多尺度红外行人车辆实时检测

红外与激光工程 2024年第5期53卷 229-239页

作者：张印辉计凯何自芬陈光晨昆明理工大学机电工程学院云南昆明650500

红外成像技术通过捕捉目标热辐射特征进行成像,能实现复杂道路场景下的目标监测和道路冗杂信息滤除。针对红外行人和车辆目标检测模型参数量大、依赖高性能GPU资源和检测速度慢等问题,提出了一种注意力引导的多尺度红外行人车辆实时检... 详细信息

红外成像技术通过捕捉目标热辐射特征进行成像,能实现复杂道路场景下的目标监测和道路冗杂信息滤除。针对红外行人和车辆目标检测模型参数量大、依赖高性能GPU资源和检测速度慢等问题,提出了一种注意力引导的多尺度红外行人车辆实时检测模型。首先,为精确匹配校准红外行人和车辆目标尺度与锚框尺寸,利用K-Means++算法对红外行人和车辆目标尺度进行先验框预置参数重聚类生成,并设计128×128精细尺度检测层;其次,设计注意力引导广域特征提取模块增强模型特征提取能力和空间及通道信息聚焦能力;随后,构建跨空间感知模块引入空间信息感知,强化不同尺度空间下的目标的特征表达能力;最后,针对资源受限设备,通过4倍通道剪枝方法降低模型参数量,增强移动端算法部署适应性。实验结果表明:所提IRDet算法与基准方法相比,模型平均检测精度提升4.3%,达到87.4%,模型权重值压缩60.4%,降至5.7 MB。

关键词：红外交通检测先验框匹配注意力引导跨空间感知模型剪枝

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

基于陕西传统文化的IP形象设计应用研究

艺术科技 2022年第20期35卷 63-65页

作者：孙茜贺寅辉西安理工大学陕西西安710054

文章基于实例分析陕西如何利用深厚的历史文化底蕴,培育和塑造具有鲜明陕西传统文化特色的原创IP,推动中华优秀传统文化实现创造性转化、创新性发展。通过视觉符号提取、时代特征体现等开发IP形象,进而转化陕西历史文化、地域文化、文... 详细信息

文章基于实例分析陕西如何利用深厚的历史文化底蕴,培育和塑造具有鲜明陕西传统文化特色的原创IP,推动中华优秀传统文化实现创造性转化、创新性发展。通过视觉符号提取、时代特征体现等开发IP形象,进而转化陕西历史文化、地域文化、文化IP的传播载体,分析陕西传统文化IP在文创设计中的创新应用,为传统文化的传播发展提供新思路,既能实现对陕西传统文化的多元化保护和传承,又能推动传统文化转型,推动IP经济良性发展。

关键词：陕西传统文化 IP形象视觉符号文化价值商业价值

多感受野特征自适应融合及动态损失调整的初烤烟叶等级检测

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

光学精密工程 2024年第2期32卷 301-316页

作者：何自芬罗洋张印辉陈光晨陈东东徐林昆明理工大学机电工程学院云南昆明650500

初烤烟叶等级的快速准确检测对开发烟叶智能分级设备以促进农产品精细化管理有着重要意义。针对相似度较高但等级不同的初烤烟叶难以区分的问题,本文提出多感受野特征自适应融合及动态损失调整的初烤烟叶等级检测网络(Flue-cured Tobacc... 详细信息

初烤烟叶等级的快速准确检测对开发烟叶智能分级设备以促进农产品精细化管理有着重要意义。针对相似度较高但等级不同的初烤烟叶难以区分的问题,本文提出多感受野特征自适应融合及动态损失调整的初烤烟叶等级检测网络(Flue-cured Tobacco Leaf Grade Detection Network,FTGDNet)。首先,FTGDNet采用CSPNet作为特征提取主干网络,采用GhostNet作为辅助特征提取网络以增强模型的特征提取能力;其次,在主干网络末端嵌入显式视觉中心瓶颈模块(Explicit Visual Center Bottleneck module,EVCB)以实现全局特征信息与局部细节特征信息融合;然后,构建多感受野特征自适应融合模块(Multi-Receptive Field Feature Adaptive Fusion module,MRFA_d),利用注意力特征融合机制(Attention Feature Fusion,AFF)将不同感受野特征图进行自适应加权融合,在增强模型局部感受野的同时突出有效通道信息;最后,设计了一种新的定位损失函数(More Complete IoU Loss,MCIoU_Loss),结合预测框与真实框面积损失以解决在回归定位过程中二者宽高比相等且中心点重合时CIoU_Loss性能退化导致定位精度下降问题,此外,引入矩形相似度衰减系数在训练过程中对真实框与预测框的相似度判别项进行动态调整,加快模型拟合。实验结果表明,FTGDNet对十个等级的初烤烟叶的验证精度达到90.0%,测试精度达到87.4%,且推理时间仅为12.6 ms。相较于多种先进目标检测算法,FTGDNet具有更高的检测精度和更快的检测速度,可为高精度初烤烟叶等级检测提供关键技术支撑。

关键词：初烤烟叶目标检测多感受野特征融合动态损失调整

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

人工智能在糖尿病领域中的应用进展

中华内分泌代谢杂志 2018年第7期34卷 539-542页

作者：何银辉杨涛丽水市中心医院、温州医科大学附属第五医院、浙江大学丽水医院内分泌科 323000 南京医科大学第一附属医院内分泌科

人工智能作为21世纪三大尖端技术之一，随着技术的发展，其在医疗领域的开发与应用成为现实，并渗透到糖尿病领域的多个方面。近年来许多研究表明，人工智能可以辅佐医师预测及诊治糖尿病，筛查糖尿病慢性并发症，参与血糖管理，识别低... 详细信息

人工智能作为21世纪三大尖端技术之一，随着技术的发展，其在医疗领域的开发与应用成为现实，并渗透到糖尿病领域的多个方面。近年来许多研究表明，人工智能可以辅佐医师预测及诊治糖尿病，筛查糖尿病慢性并发症，参与血糖管理，识别低血糖。本文主要简述人工智能在糖尿病诊治、并发症筛查及血糖管理中发挥的作用及应用进展。

关键词：人工智能糖尿病糖尿病视网膜病变低血糖症

维普期刊数据库